Why do you think that app tokens have no value, when we are able to trade it for bitcoin in exchanges?
The ability to trade something doesn't necessarily give it any particular value. I said they have no utility and thus no value other than as a unit of speculation. But the supply of units of speculation is not going to be limited, as everyone jumps on board offering Ethereum smart contract project app tokens.
My point is that when someone makes a project that enables apps to be monetized by some means other than app tokens, then those app token projects will have competitors who have viable business models, whilst app tokens have no utility and thus are not viable (per the reasons provided in the OP). So app tokens will collapse in value at that point. And I think that will be coming soon enough (perhaps in 2017).
Then can we compare app tokens with bitcoin or any other altcoin, are we now in the same page or these are two different things (from the value perspective)
I think that bitcoin can be joined here too as it has value but it changes by the speculation, investments and other factories which can lead to pump or dump the bitcoin price.
We know that if people are not interested in a coin then the price/value of that coin will drop dramatically until 1 satoshi or zero.